Improvement in back-lashes for mill-gearing



Inl/@mmm N. PETERS, PHOTO-LITHOGRAPHER, WASHINGYON. |16.

N. PETERS. PHOTO LTHOGRAPMER m W m dimitri tate JOHN L. POST, OF ASHLEY, ILLINOIS.

Letters Patent No. 108,515, dated October 18, 1870.

IMPROVEMENT iN eAcK-LAsHES FOR MILL-GEARING.

i The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, J OHN L. Ios'r, of Ashley, in the county of iVashington and State ot' Illinois, have invented a new and valuable Improvement in Devices forPrcventing Back-Lash, and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine, reference being had to the annexed drawing making a pai-tof this specification, and to the letters and figures of reference marked thereon.

Figure l of the-drawing is a representation of a central vertical section of my invention.

Figure 2 is a perspective view of the same.

Figure 3 is a view of the spring-case, with drivingplate removed.

Figures 4, 5, and 6 are details.

My invention relates to an improvement in means for preventing the back-lash or irregular movement of' millstones; and

It consists in the construction and novel arrangement of devices designed to increase the action of the springs, to prevent undue friction, and to sustain the weight of the false pinion.

The letter A of the drawing designates the drivingplate, secured firmly to the pinion B, which is loose upon the shaft O ot' the millstone.

To the under side ot the plate A are secured the forked lugs d, arranged to engage with the semi'- cirenlar springs hereinafter' described.

E represents the lower case, which contains the springs, and rotates with the shaft oi' the millstone, to which it is firmly keyed.

F designates the circular' chamber in which the springs lie. This chamber is rectangular' in-its crosssection, and the object of giving it this form is to obviate as much as possible the friction of the walls against the springs.

G is the central sleeve, which embraces the shaft. 1t is-designe'd to project upward through the drivingplate A, and to form a bearing for the pinion B, thereby sustaining its weight and that of the drivingplate A, and thus in an important manner lessening the friction.

The chamber 11 is subdivided into two semicircular compartments by the slotted partition-plates h, securely attached to the'lateral walls of the chamber.

H H represent the coiled springs which operate to prevent the back-lash. They are designed to extend from one partition, li., to the other, a distance of one hundred and eighty degrees. The ends of these two semicircnlar springs are secured together by means of the coupling K. This coupling consists of two vertical cheeks, l l, connect'ed at their lower ends by a plate, m, notched at each side to admit the edges of the slot of Vthe partition-plate h. 'lhey are also connected at the top by a cross-bar, n.

The end of each coil-spring is turned within the cheek which lies on they same side of the partition h. Thus the springs are secured iirmly together at their ends.

At about the middle of each spring ,a set-olf, s, or horizontal extension of the coil-wire, is formed. On each side of this set-off descend the ends of the forked lugs d of the driving-plate A, thus formingthe engagement between this plate and the springs.

What I claim as my invention, anddesire to secure by Letterslatent, is`

1. The spring-case E, provided with the sleeve G, projecting above the driving-plate to form a bearing for the loose pinion B, as an improvement in machinery for preventing back-lash, as specified.

2. The semicircnlar springs H, connected by the coupling-slides K, and each provided with the set-oiIr s at about its middle portion, in combination with the transverely-rectanguiar' spring-chamber F, having the slotted partition h., and 'with the drivingplate A provided with the forked lugs d, substantially as shown and described, and for the .purposes Y specified.

In testimony that I claim the above, I have hereunto subscribed my name in the presence of two wit- DCSSGS.

' J N O. L. POST.

Witnesses:

J As. M. DURHAM, J No. T. SHOWALTER. 

